21. a1e1  21... f8g7 Adding more problems to Black's position. 22. f3f4 This is essentialy a winning move. White prevents Qd6, which is Black's only plan. It's curious that Sarana played very fast up to this point. Something went really wrong with his opening preparation. 22... a8c8  23. d3f1 Black is paralyzed as there's no way to get out of the pin. White can play h4 followed by Bh3 and reinforce the position as he pleases, so Sarana decides to sac a pawn in order to create some chances.